﻿<p><em>IfcMetricValueSelect</em> is a select type that enables selection of the data type for the value component of an <em>IfcMetric</em>.</p> 

<p>Types are used as follows:</p>
<ul>
  <li><i>IfcValue</i>: A constant value using project default units.</li>
  <li><i>IfcMeasureWithUnit</i>: A constant value using specified units.</li>
  <li><i>IfcAppliedValue</i>: A value calculated from a formula.</li>
  <li><i>IfcTable</i>: A value retrieved from a table.</li>
  <li><i>IfcTimeSeries</i>: A value that varies over time.</li>
  <li><i>IfcReference</i>: A value referenced on an object attribute.</li>
</ul>

<blockquote class="history">
HISTORY&nbsp; New type in IFC2.0.
</blockquote> 

<blockquote class="change-ifc2x4">
IFC4 CHANGE&nbsp; IfcValue added, which includes removed IfcDateTime and IfcText; IfcReference added.
</blockquote> 